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while learning Rails, I keep hearing Local vs Instance but I can't find a definition of the two & the differences. And I'd like to avoid making assumptions.
What are the two and how are they different?
Thanks
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Difference Between Instance Variable and Local Variable An instance variable is a variable declared in a class, but outside a method. These variables represent the object state throughout the class. Any object of that class has its own copy of that instance variable.
Instance Variable: These variables are declared within a class but outside a method, constructor, or block and always get a default value. These variables are usually created when we create an object and are destroyed when the object is destroyed.
A local variable is a variable that is declared inside a method or a constructor. Local variables are created when entering the method or a constructor. Similarly, exiting the method or a constructor destroys these variables. Therefore, local variables are only visible within the declared method or the constructor.
They are defined in class but outside the body of methods. They are defined as a type of variable declared within programming blocks or subroutines. These variables are created when an object is instantiated and are accessible to all constructors, methods, or blocks in class.
The main difference between local and instance variable is that local variable is only available in controller, where as instance variable is available in corresponding views also. The controller and views do not share local variables.
Thanks, Anubhaw
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The main differences between local and instance variables are as follows
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